How many times have you had more than 1 explosive placed at once, but had to detonate either all or none of them? Let's say you have a satchel placed on the road for an ambush, but you also have another satchel placed further along the road either for more destruction or in case someone tries to escape. But then you run into a dilemma, if you blow up the first satchel you also have to blow up the second satchel at the same time.
My solution is to add the ability to add detonators to each explosive that uses "touch off", this way we can group certain explosives together and have individual explosives. What if you want to place a satchel down on the road but also cover your back with a claymore? Once you see or hear that enemy behind you, you can either blow up the claymore and the satchel at the same time or risk a firefight.